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Finding the Fourth Proportional to 2,083.78, 3,126.08 and 987.55

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Solution

The fourth proportional to 2,083.78, 3,126.08 and 987.55 is: 1,481.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,083.78 : 3,126.08 = 987.55 : x
  2. Step 2: Convert to fraction form
    2,083.78/3,126.08 = 987.55/x
  3. Step 3: Cross multiply
    2,083.78x = 3,126.08 × 987.55
  4. Step 4: Simplify right side
    2,083.78x = 3,087,160.30
  5. Step 5: Solve for x
    x = 3,087,160.30/2,083.78
  6. Step 6: Final answer
    x = 1,481.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.